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Metallized polyethylene film with improved metal adhesion

a metal adhesion and metal technology, applied in the field of metal adhesion improved polyethylene film, can solve the problems of poor metal adhesion, polyethylene (pe), and limit the application of bond strength to the end user

Active Publication Date: 2016-05-26
DOW CHEM MALAYSIA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is for a multi-layer structure that includes a skin layer made of a specific type of plastic, a metal layer, and a substrate layer. This structure does not contain any migratory additives and is formed using a special process. The plastic used in the skin layer is made up of a specific ratio of ethylene and α-olefin units. The technical effect of this invention is to provide a durable and flexible multi-layer structure that has good barrier properties and can be used in various applications such as packaging and construction materials.

Problems solved by technology

Commercially available metallized packaging films made from polyethylene (PE) face issues of poor metal adhesion and bond strengths limiting their end use application.
Such PE-based metallized films typically exhibit very poor bond strength due to poor metal adhesion to the metalized skin layer leading to challenges during lamination as well as poor barrier properties due to metal transfer.

Method used

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  • Metallized polyethylene film with improved metal adhesion
  • Metallized polyethylene film with improved metal adhesion
  • Metallized polyethylene film with improved metal adhesion

Examples

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Effect test

example 1

Inventive Multi-Layered Film Example 1

[0055]A three layer film, having a skin layer, a core layer abutting the skin layer on a first side of the core layer and a sealant layer abutting the core layer on a second side of the core layer. 50 kg of an experimental LLDPE (EXPERIMENTAL EPE 1), having the properties shown in Table 2, was used to make a three layer blown film with EXPERIMENTAL EPE 1 in the skin layer (layer to be metallized) and the sealant layer. The core layer was ELITE™ 5960G. A blown film machine used to make the three layer blown film are as follows: three layer blown film screw type extruder for LDPE and LLDPE (linear low density polyethylene) having a die diameter of 400 mm, die gap of 2.2 mm, BUR of 2.5 and bubble cooling with IBC, output of 420 kg / hr, film width maximum of 2200 mm, film thickness of 40 micron, layer ratio of 1:1.5:1 and corona treatment of about 46 dynes. The melt temperature was kept at 225° C. and die temperature at 220° C. Table 1 below provides...

##ventive example 2

Inventive Example 2

[0072]A second three layer blown film, Inventive Multi-Layered Film Example 2, was also made using the resins shown in Table 4.

TABLE 4ResinI2 (190° C., g / 10 min)Density (g / cc)EXPERIMENTAL EPE 10.850.907ELITE ™ 59600.850.962RELENE 1020FA2020.92

[0073]RELENE 1020FA20 is a low density polyethylene resin commercially available from Reliance Industries Ltd. (India). Inventive Multi-Layered Film Example 2 was made on a commercial three layer blown film, screw-type machine for LDPE and LLDPE with mixing sections; die diameter of 325 mm; die gap of 2.5 mm; BUR of 2.0; bubble cooling: with IBC; output of 195 kg / hr; film width maximum of 1230 mm; film thickness of 40 micron; layer Ratio of 1:1.5:1; and corona treatment of about 50 dynes. Table 5 provides the zone temperatures, in ° C., for the blown film machine in preparing Inventive Multi-Layered Film Example 2

TABLE 5ZoneZoneZoneZoneEXTRUDERS1234AdapterScreenSealant layer180185195200205208Core layer205205210215220220Skin l...

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Abstract

A multi-layer structure comprising: (a) a skin layer comprising at least 50% by weight of an ethylene / α-olefin interpolymer composition (LLDPE) having a Comonomer Distribution Constant (CDC) in the range of from 45 to 400, and wherein the skin layer does not contain any migratory additive; (b) a metal layer disposed on the skin layer to form a metalized film; and (c) at least one substrate layer laminated onto the metallized film; wherein the ethylene / α-olefin interpolymer composition comprises (i) less than or equal to 100 percent by weight of the units derived from ethylene; and (ii) less than 30 percent by weight of units derived from one or more α-olefin comonomers is provided.

Description

FIELD OF INVENTION[0001]The instant invention relates to a metalized polyethylene film with improved metal adhesion.BACKGROUND OF THE INVENTION[0002]Commercially available metallized packaging films made from polyethylene (PE) face issues of poor metal adhesion and bond strengths limiting their end use application. These metalized PE films have PE in the skin layer(s) which may contain low molecular weight fractions of PE and low molecular weight high comonomer fractions of linear low density polyethylene (LLDPE). Such PE-based metallized films typically exhibit very poor bond strength due to poor metal adhesion to the metalized skin layer leading to challenges during lamination as well as poor barrier properties due to metal transfer. It would be desirable to produce metalized polyolefin films having the desired stiffness and also with improved metal adhesion properties.SUMMARY OF THE INVENTION[0003]The instant invention is a multi-layer structure.[0004]In one embodiment, the insta...

Claims

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Application Information

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IPC IPC(8): B32B15/085B32B15/09B32B1/02B32B7/12
CPCB32B15/085B32B7/12B32B15/09B32B2439/00B32B2250/03B32B2307/7242B32B1/02B32B27/32B32B27/36B32B7/00B32B7/04B32B15/00B32B15/04B32B15/08B32B27/00B32B27/06B32B27/08B32B2255/00B32B2255/06B32B2264/00B32B2307/00B32B2307/40B32B2307/514B32B2307/518B32B2307/542B32B2307/544B32B2307/546B32B2307/732B32B2307/75B32B2439/06B32B2439/46B32B2439/70B32B2250/00B32B1/00
Inventor SHAH, PRAJWALMISHRA, SHASHIBHUSHAN S.DUGGAL, TAMANNAMOGRE, PRASHANTMA, ENG KIAN
Owner DOW CHEM MALAYSIA
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